How to replave the harddrive in the HP Pavilion...

Question

How to replace a harddrive on the HP Pavilion a362n The hard drive is in a fixed standup postion and in a fram unlike most setups. I have worked on computer for about 24 years or back to 1979 with the old Leading edge model D but this is a problen that I just can't seam to shake ant help would be great.

Thanks